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Old 18th December 2012, 12:08 AM   #8141
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This is 3 years old.
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File Type: pdf MPP Basic Structure 2.0.TSC - TINA.pdf (122.6 KB, 75 views)
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Old 18th December 2012, 12:11 AM   #8142
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I build it and it worked great. Problem solved. Thread over after 3 posts.

Last edited by Joachim Gerhard; 18th December 2012 at 12:13 AM.
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Old 18th December 2012, 12:12 AM   #8143
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Here is one channel.
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File Type: jpg MPP - 2 - .jpg (188.4 KB, 231 views)
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Old 18th December 2012, 12:19 AM   #8144
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I little bit off topic but i found this for our contributors that fly in a simulator :http://www.analog.com/static/importe...tes/AN-138.pdf
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Old 18th December 2012, 12:32 AM   #8145
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Time to go to bed
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Old 19th December 2012, 10:26 AM   #8146
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What i would really like to build is the circuit you can download here. If we count a folded cascode as a one stage amplifier this can work. I have done the folded cascodes referenced to the constant current sources. That can be substituted with fixed bias.
The circuit may have some bugs but it is a starting point.
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File Type: pdf MPP Transimpedance.pdf (50.4 KB, 76 views)
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Old 19th December 2012, 10:28 AM   #8147
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The values of the RIAA are only place holders. We need a simulation to find out the right values with the gain we want. I did not try the servo, it is only an idea.
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Old 19th December 2012, 10:38 AM   #8148
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You can be sure this works fine.

The output current of the OP may not be high enough to compensate for offset
(remember Vled is a weak function of current). R15 should be zero.
Perhaps a non inverting servo is necessary here?
You may want to connect R16 to output VF3.

P3 and P4 are not required.
R4,C5 and R5 ,C* are also not required in my opinion.
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Old 19th December 2012, 11:22 AM   #8149
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OK, fine. When i find the time i will build it.
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Old 19th December 2012, 11:35 AM   #8150
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MiiB, i made a new BJT buffer, just in case we would like to try something different then the current Paradise J-Fet buffer. I call it a Szikley Diamond. Circuit comes soon.
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